Condensed Consolidated Statements of Redeemable Noncontrolling Interest, Stockholders' Deficit and Noncontrolling Interest - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interest	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total Stockholders' Deficit	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018			109,421,183
Beginning balance at Dec. 31, 2018		$ 57,261	$ 11	$ 2,481,352	$ 131	$ (2,624,104)	$ (142,610)	$ 125,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)			2,960,462
ESPP purchase (in shares)			696,036
ESPP purchase				6,916			6,916
Exercise of stock options (in shares)			136,382
Exercise of stock options				577			577
Stock-based compensation expense				63,166			63,166
Unrealized loss on available for sale securities	$ 17				17		17
Change in effective portion of interest rate swap agreement					(143)		(143)	(2,048)
Distributions to noncontrolling interests		(282)						(2,613)
Cumulative effect of hedge accounting						130	130	(130)
Net income (loss)	(108,752)	1,823				(104,920)	(104,920)	(5,655)
Ending balance (in shares) at Mar. 31, 2019			113,214,063
Ending balance at Mar. 31, 2019		58,802	$ 11	2,552,011	5	(2,746,890)	(194,863)	114,664
Beginning balance (in shares) at Dec. 31, 2019			121,036,289
Beginning balance at Dec. 31, 2019		443	$ 12	2,686,759	19	(2,946,384)	(259,594)	91,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment of embedded derivative related to debt extinguishment				(24,071)			(24,071)
Issuance of restricted stock awards (in shares)			3,010,606
ESPP purchase (in shares)			992,846
ESPP purchase				4,177			4,177
Exercise of stock options (in shares)			110,949
Exercise of stock options				667			667
Stock-based compensation expense				21,676			21,676
Unrealized loss on available for sale securities	0
Change in effective portion of interest rate swap agreement					(5)		(5)	(8,209)
Distributions to noncontrolling interests		(1)						(3,897)
Net income (loss)	$ (81,642)	(375)				(75,949)	(75,949)	(5,318)
Ending balance (in shares) at Mar. 31, 2020			125,150,690
Ending balance at Mar. 31, 2020		$ 67	$ 12	$ 2,689,208	$ 14	$ (3,022,333)	$ (333,099)	$ 73,867